Ashlee Simpson is the daughter-in-law to Diana Ross and sister-in-law to Tracee Ellis Ross.
In 2014, Ashlee married actor and musician Evan Ross, the son of legendary singer Diana Ross and her second husband, the late Arne Naess Jr. The two are parents to daughter Jagger as well as Ashlee's son, Bronx, from her marriage to Pete Wentz. Evan's half-sister also happens to be Black-ish star Tracee Ellis Ross, who, of Ashlee and her older sister Jessica, has said, "It's really cool. Who knew I was going to grow up and have Ashlee and Jessica Simpson as my new siblings?!"
Basically, because of Evan's famous lineage, Ashlee and Jessica get to celebrate holidays and family reunions, and probably sing karaoke, with Diana freaking Ross.